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Evgesh-ka [11]
3 years ago
15

The equation, DF + heat Imported Asset D + F, is an example of an endothermic reaction.

Chemistry
2 answers:
zvonat [6]3 years ago
4 0
The answer is TRUE.

If the Energy is on the left, then the problem is true. If it is on the right then it would be negative, false, and considered as exothermic.

Endothermic reaction = the products are higher in energy than the reactants.
Exothermic reaction = a chemical reaction that releases energy by light or heat.
Readme [11.4K]3 years ago
4 0

Answer: It is true that the given example is an endothermic reaction.

Explanation:

Endothermic reaction is defined as the reaction in which reactant species absorb heat from the surrounding or from a source.

For example, DF + Heat \rightarrow D + F is an endothermic reaction.

Energy of products is more than the energy of reactants in an endothermic reaction.

On the other hand, a reaction in which heat is released by reactant species is known as an exothermic reaction.

For example, AB \rightarrow A + B + Heat is an exothermic reaction.

Energy of products is less than the energy of reactants in an exothermic reaction.

Hence, we can conclude that the given equation, DF + Heat \rightarrow D + F, is an example of an endothermic reaction.

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In what sense is the wave motion of a guitar string analogous to the motion of an electron in an atom?
STALIN [3.7K]

Explanation:

A guitar string vibrates when we strikes it. It starts vibrating in several modes simultaneously. It stretches between the saddle and the nut. This distance represents one-half wavelength.

Now if we consider that the string forms a circle, then we have an interpretation of an electron which vibrates in the orbit surrounding the nucleus. We are aware that electrons have wavelength. If the circumference of the orbit happens to be the integer multiple of wavelength , then the orbit is "allowed" since "the electron will retraces its own path."

This explains the line spectrum and not a continuous spectrum.

A line spectrum refers an electron that jumps between the specific energy levels, thus producing only specific colors.

7 0
3 years ago
A man heats a balloon in the oven. If the balloon initially has a volume of 0.4 liters and a temperature of 20 degrees celsius,
Airida [17]

Answer:

0.714 liter.

Explanation:

Given:

The balloon initially has a volume of 0.4 liters and a temperature of 20 degrees Celsius.

It is heated to a temperature of 250 degrees Celsius.

Question asked:

What will be the volume of the balloon after he heats it to a temperature of 250 degrees Celsius ?

Solution:

By using:

PV=nRT

Assuming pressure as constant,

V∝ T

Now, let  K is the constant.

V = KT

Let initial volume of balloon , V_{1} = 0.4 liter

1000 liter = 1 meter cube

1 liter = \frac{1}{1000} m^{3} = 10^{-3} m^{3

0.4 liter = 0.4\times10^{-3}=4\times10^{-4} m^{3}

And initial temperature of balloon, T_{1} = 20°C = (273 + 20)K

                                                                          = 293 K

Let the final volume of balloon is V_{2}

And a given, final temperature of balloon, T_{2} is 250°C = (273 + 250)K

                                                                                          = 523 K

Now, V_{1} = KT_{1}

          4\times10^{-4}=K\times293\ (equation\ 1 )

V_{2} = KT_{2}

    =K\times523\ (equation 2)

Dividing equation 1 and 2,

 \frac{4\times10^{-4}}{V_{2} } =\frac{K\times293}{K\times523}

K cancelled by K.

By cross multiplication:

293V_{2} =4\times10^{-4} \times523\\V_{2} =\frac{ 4\times10^{-4} \times523\\}{293} \\          = \frac{2092\times10^{-4}}{293} \\          =7.14\times10^{-4}m^{3}

Now convert it into liter with the help of calculation done above.

7.14\times10^{-4} \times1000\\7.14\times10^{-4} \times10^{3} \\0.714\ liter

Therefore, the volume of the balloon be after he heats it to a temperature of 250 degrees Celsius is 0.714 liter.

5 0
3 years ago
In a lab, the mass of object A is 2.5 kg. Object A weighs:
zzz [600]
24.5 N hope it helps
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3 years ago
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The energy stored in foods and fuels is?
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Chemical potential energy
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Where photosynthesis takes place?
Vlad [161]

Answer:

chloroplasts

Explanation:

3 0
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